Amazing Organic Weed Killer Spray. 1/2 gallon of Apple Cider Vinegar 1/4 c table salt 1/2 tsp Dawn liquid dish soap Mix and pour into a spray bottle Spray weeds thoroughly. It makes 1/2 gallon and worked better than Round Up & killed the weeds on first application. The Dawn dish soap strips the weed of it’s protective oils so the vinegar can work with deadly force. Safe to use a yard used by pets